ATLANTA (AP) — Temperatures fell to 10 degrees before dawn in Marietta, Cartersville and Rome and 12 in Atlanta as an arctic blast of frigid weather brought the coldest temperatures in a year to Georgia.

It was even colder in the north Georgia mountains. A U.S. Forest Service weather station recorded an air temperature of 0 degrees shortly after 5 a.m. Thursday at Brasstown Bald, Georgia's highest peak.

School districts were delaying start times and warming shelters were open across the state.

A wind-chill advisory Thursday morning included all of northern and central Georgia and parts of south Georgia, including Vidalia, Americus and Statesboro.

The wind chill — the combination of air temperature and wind — was 4 degrees below zero before dawn Thursday in the northwest Georgia town of Calhoun.